Hi, yeah you're right. selenium can indeed provoke reactions in some people, because of it's action in the body with mercury. For some it can help them improve and encourage detox from mercury, for me, nowadays, I don't tolerate it. Others can. I used to be able to use selenium and it helped improve me from mercury toxicity once years ago and it worked VERY well. I used only vitamin C powder, selenium and vitamin E and they worked very good together at that time. I do not know how exactly because it does nt directly chelate mercury, but I have no doubts it can encourage a person in detoxing it or mobilising it.